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Home >> Chevrolet >> 2009 >> Traverse LS, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - 6T75 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Diagnostic Information And Procedures >> Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test >> Test Procedure

Test Procedure

  1. Remove the control solenoid (w/body and TCM) valve assembly from the transmission.
  2. Bolt the DT-47825-100  test block to the control solenoid (w/body and TCM) valve assembly on the valve body mounting surface. See Special Tools . Use the bolts and washers supplied with the tool to attach the test block. Tighten the bolts to 5 N.m (44 lb in) using a center out alternating torque sequence.
  3. Install the pressure gage to the affected solenoid air port. Reference component to air port table.
  4. Connect the shop air pressure line to the DT-47825-100  test block air psi inlet port. See Special Tools .
  5. Connect DT-47825-20  to vehicle and control solenoid (w/body and TCM) valve assembly. See Special Tools .
    6. Fig 1: Identifying Special Tool - DT-47825-20
    GM1845338Courtesy of GENERAL MOTORS CORP.
    CAUTION: Do not energize the solenoids for more than two minutes or the solenoids could be damaged.
  6. Ignition ON, with a scan tool command the solenoid in question On and Off. Watch the air pressure gage and look for the change in pressure as you command the valve On and Off. The valve should allow air pressure to flow through the valve port to the gage with a result of pressure reading on the gage. If the valve is stuck closed, no pressure change will occur. Command the solenoid valve On and Off several times to determine the state of the solenoid valve in question. Release the air pressure in the gage between pressurization tests.
Control Solenoid (w/Body and TCM) Valve Assembly Solenoid Performance Test Block to Component Identification

COMPONENT PORT ON TEST BLOCK Key On, Engine Off (KOEO) Normal State
PC Solenoid 1 A Regulated PSI flow to gauge
PC Solenoid 2 C No PSI flow to gauge
PC Solenoid 3 G Full PSI flow to gauge
PC Solenoid 4 B No PSI flow to gauge
PC Solenoid 5 F No PSI flow to gauge
Shift Solenoid 1 H Full PSI flow to gauge
Shift Solenoid 2 D No PSI flow to gauge
TCC PC Solenoid E No PSI flow to gauge
NOTE: With the key on engine off (KOEO), the TCM will normally cycle some of the transmission solenoids On and Off to facilitate keeping the ports and solenoids clean and free of debris. This dither function is a normal activity and will cause the valves to cycle open and closed quickly when the TCM is powered up. This can cause the psi gage to flicker high and low as the valves open and close. This may cause some air to exit the ports where the psi gage is not connected as those solenoids cycle on and off.

Drain the TCM of excess transmission fluid before attaching to test block and use caution when attaching air to test block air inlet.

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